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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a782b269d084b25d0234e78d68c1ef7d4e4ebb1e7dbe4e720f1dd1282df2ad5' 
  AND token = 'iWuJXMYSgewO+TMa1Qsn9jllx+KpJTyXkPZxs68dzbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}